function isNumero(evt){
		if(window.event){// IE
			keynum = evt.keyCode;
		}else{
			keynum = evt.which;
		}
		//alert(keynum);
		if((keynum>47 && keynum<58) || keynum == 0 || keynum == 8){
			return true;
		}else{
			return false;
		}
	}